{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:YWDGY3NENEZKCD7OIIMX5W4CTT","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4da0998acdb417042e796af18663ccf2dc6aceea238e5f69df939228f3b68c5d","cross_cats_sorted":["cs.FL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2012-01-09T13:40:34Z","title_canon_sha256":"49d832ec176aed8daf1a7cfdedc00acb718d0a790cc566adf5f97d370ad70535"},"schema_version":"1.0","source":{"id":"1201.1754","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.1754","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"arxiv_version","alias_value":"1201.1754v1","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.1754","created_at":"2026-05-18T04:04:55Z"},{"alias_kind":"pith_short_12","alias_value":"YWDGY3NENEZK","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"YWDGY3NENEZKCD7O","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"YWDGY3NE","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:9be0c8e98ff08835e82a4d6629ee6037bfbcad3fc747d42d25436c312980af80","target":"graph","created_at":"2026-05-18T04:04:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"One of the most interesting questions concerning hierarchical control of discrete-event systems with partial observations is a condition under which the language observability is preserved between the original and the abstracted plant. Recently, we have characterized two such sufficient conditions---observation consistency and local observation consistency. In this paper, we prove that the condition of observation consistency is undecidable for non-regular (linear, deterministic context-free) languages. The question whether the condition is decidable for regular languages is open.","authors_text":"Tom\\'a\\v{s} Masopust","cross_cats":["cs.FL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2012-01-09T13:40:34Z","title":"A Note on Undecidability of Observation Consistency for Non-Regular Languages"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.1754","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9ee5379cc1d1ba595de90311644ac8fbbd051a2bc816e1e23f602aef0859750b","target":"record","created_at":"2026-05-18T04:04:55Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4da0998acdb417042e796af18663ccf2dc6aceea238e5f69df939228f3b68c5d","cross_cats_sorted":["cs.FL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2012-01-09T13:40:34Z","title_canon_sha256":"49d832ec176aed8daf1a7cfdedc00acb718d0a790cc566adf5f97d370ad70535"},"schema_version":"1.0","source":{"id":"1201.1754","kind":"arxiv","version":1}},"canonical_sha256":"c5866c6da46932a10fee42197edb829cd7e6f53682bcd41a500df9b2263497dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c5866c6da46932a10fee42197edb829cd7e6f53682bcd41a500df9b2263497dd","first_computed_at":"2026-05-18T04:04:55.798871Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:04:55.798871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LZRNEgz91UGINK6Rc2UUOlQUtTNT54AjoFk98vjtWfnoAH78lMGTt09MJT5hycMOX0EyUZ+lZYOS2h4ozaghBg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:04:55.799306Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.1754","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9ee5379cc1d1ba595de90311644ac8fbbd051a2bc816e1e23f602aef0859750b","sha256:9be0c8e98ff08835e82a4d6629ee6037bfbcad3fc747d42d25436c312980af80"],"state_sha256":"1c1a537e47023980a71daf914e2ad1306ac6e35c93b59c01355430eeaf74f450"}